Per the ad on Auction Arms:

UMAREX #213-7509 Hyper Velocity Pellets .177 Caliber, 200 ct.
RWS Hyper Velocity Pellets produce ultra high velocities in all medium powered air rifles. RWS Hyper Velocity Pellets sit inside a plastic sabot that provides a snug barrel fit for optimum velocity and accuracy. These lead free pellets will not produce lead particles in the air, in your barrel, or leave lead residue on your fingers.

Specifications:

- Caliber: .177
- 200 ct.

Mfg: UMAR
MfgNo: 213-7509

Ive used them, they're hard hitters for sure but they lose a lot in accuaracy.

I have some , and theyre Ok to keep in your pellet box for trying differnt things out , but I dont shoot them regularly.

Then again, it depends on the average range your shooting at too. I guess theyd be fine for fairly close work .(watch the riqocets)

Here's the thing, if your useing them for hunting A good lead pellet will expand and cause more damage.

If your useing them for target, a good lead pellet is more accurate.

So im not seeing the advantage , except for penatration .

thats just my take on it,

OOPS! thought you were a new guy.

Was just wondering if they were new. What's the weight on them? Are they as light as the other non-lead pellets such as Gamo and Crosman? If so, don't think I will be shooting them in any springers.

And no messing with me, pullease! I've had enough for one night!

They have been sold under the Prometheus & Titan label as far back as the early 90's possibly even the late 80's in England. They did not really catch on since they need to be fired from an unchoked barrel to be accurate. They do have tremendous penetration because of the hard alloy tip. Can't remember the weight but they were pretty light compared to lead pellets.

Best Regards,
Sixto

PA has them listed as 11 gr.in.22

5.7, 6.4 ,and 8.5 in .177

The ones you have in the picture was actually sold under the Spenco label. I'm not sure if they are affiliated with the original British makers. They might have been copied by Spenco after the original British design which had a much smoother looking alloy insert. Also if you ever run into any old Theobens that have unchoked barrels, they were specifically sold by Theoben to use this particular design pellet.

Best Regards,
Sixto

This pellets are too light and with out accuracy with medium-strong springers. Also they leave plastik in the barrels and many airguners say that are destroying them. Not one resson to trie this pellets exept penetration.

Prometheous style lightweight pellets in sabots are suitable for ice picking.
8 grain lead pellets fired from a mild mannered Diana 27 will kill squirrels.
The same pellets will bounce off racoon skulls.
At close range, 5 grain pointed Prometheous pellets from a 27 will punch holes in racoon skulls.

trying them on my Beeman R10 back in the late 80's. This was back when I was a teenager, back then it was all about penetration. My friends & I would try shooting into different materials to find out how well it would penetrate. Practically useless as a hunting pellet, it did not group very well & it would ice pick into what ever live game you shoot at.

Best Regards,
Sixto

red feather- i have chronographed these in 4 different air rifles and 3 different air pistols and they have the fastest muzzle velocity of any pellet i have ever tested. on a penetration test they went through 541 pages of a phone book compared to crossman copperheads (78 pages), PBA golds (257 pages), PBA silvers (232 pages), daisy power pellet max speeds (191 pages) and gamo hunters (133 pages.) on a progresso soup can penetration test (supposed to be the toughest) they went cleanly through both sides of the can without tipping it over at about 15 feet. i have not tested them for accuracy so i cannot comment on that. if you are looking for a superfast muzzle velocity or penetration these are your pellets.

for miniature Rhinos and Elephants. If you use these saboted rounds and suspect they are leaving plastic in the bore, you can remove it with a good shotgun cleaner made for removing plastic residue from shot shells. I think I've seen carburetor spray cleaner recommended, as well. They still sell that stuff with all the fuel injected engines running around?

those pellets are not exactly sabot types at all,
because the plastic skirt remains attached to the metal head and does not detach itself once the pellet is in flight out of the barrel.

Sabot projectiles are designed to be sub calibre and rely on synthetic jackets to provide a good gas/air seal in the bore.This jacket then falls off a few metres away from the gun while the projectile carries on at speed to hit the intended target.

Back in the 80's, a company made true sabot airgun pellets which included an applicator to load the pellet in the barrel.
It had all the credentials for being a quantum leap in airgun projectile design, but from my experiences with them, they were less accurate than top quality diablo style in any of my airguns.

Never did any proper testing why this happened, they were very expensive for that sort of thing then, but theoretically they should have performed well.
I believe that with today's materials, special rifling and fired from PCP's which accelerate steadily rather than blast the pellets as in springers, good performance is achievable.

I would imagine air guns are rifled for the diabolo style pellet. Perhaps the pellet used had a different length/width ratio? I should think that saboted bullets could be fired from PCP's and, in fact, are being used. Thought about paper patching something like a .17 Remington bullet and shooting it out of Blue Streak just to see if it was feasible. Of course, I would have to muzzle load it. That would make for an extremely loooooong range session (as if pumpers don't take enough time between shots).

Someone ought to be able to come up with a sub-caliber pellet with better ballistic coefficient using a sabot. Might take a special barrel, but could be done.

I have heard that firing these light pellets can brake spring, pistons, & other bad stuff. Not enough back pressure to keep the piston from slaming the front of the tube. Im guessing it wont be much of a problem in a lower power gun. I think the Gamo guns are designed to take the abuse. I hear the factory dry fires them a zillion times during testing.

Airguns do not develop enough MV to stabilize bullet shaped projectiles. Airguns NEED the parachute effect to stabilize the projectiles, that is why bullet-type prpjectiles do not work out of airguns.

If you want to read about previous experiments, look for "Viper" in the more general fora and you will see some experiments performed.

To stabilize a bullet shaped projectile, airguns would need twists in the region of 1 in 8".

As for the Sabo's that were made in the UK some time ago, my experiments showed that the sabo itself was well made, but the projectile was horrible. Turned from brass projectiles performed very well out of Dianas 48's and 52's in both 0.177" and 0.22"

Keep well!






Un Abrazo!




H�ctor

Maybe RWS should make a film where they run up to a hog and start shooting it in the head with super high velocity rounds haha. Then cut off the camera and jab it with a spear 12-15 times, then cut the camera back on and shoot it in the head again. It did wonders for gamo's pba round.

but no seriously most lead free rounds are a joke-
plus I wonder if the hardness of the materials is not bad for barrels?